利用POI实现简单的Excel读写操作

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利用POI实现简单的Excel读写操作

java 代码

package test;

import java.io.FileInputStream;
import java.io.FileOutputStream;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;

public class POIExcelService
{
    private POIFSFileSystem fileSystem;
    private HSSFWorkbook workbook;
    private HSSFSheet sheet;
    private HSSFRow row;
    private HSSFCell cell;

    public POIExcelService(){}

    /**
     *
     * @param xlsPath
     */
    public POIExcelService(String xlsPath) throws Exception
    {
        this.fileSystem = new POIFSFileSystem(new FileInputStream(xlsPath));
        this.workbook = new HSSFWorkbook(fileSystem);
    }

    /**
     * 获取单元格数据,以String格式返回
     * @param sheet
     * @param row
     * @param cell
     * @return
     */
    public String getCellValue(int sheet,int row,int cell)
    {
        setSheet(sheet);
        setRow(row);
        setCell(cell);
        return this.getCell().getStringCellValue();
    }

    //导出文件
    public void Export(String xlsPath, int sheet, int row, int cell, String value) throws Exception
    {
        FileOutputStream fileOut = new FileOutputStream(xlsPath);

        this.setSheet(sheet);
        this.setRow(row);
        this.setCell(cell);
        this.getCell().setCellValue(value);

        this.workbook.write(fileOut);

        fileOut.close();

    }

    public HSSFCell getCell() {
        return cell;
    }

    public void setCell(int cell) {
        this.cell = this.row.getCell((short)(cell-1));
    }

    public HSSFRow getRow() {
        return row;
    }

    public void setRow(int row) {
        this.row = this.sheet.getRow(row-1);
    }

    public HSSFSheet getSheet() {
        return sheet;
    }

    public void setSheet(int sheet) {
        //默认是从0开始的,这里利用n-1转换下,用1开始,调用好理解点
        this.sheet = this.workbook.getSheetAt(sheet-1);
    }

    /*
    public String getCellStringValue(HSSFCell cell) {
        String cellValue = "";
        switch (cell.getCellType()) {
        case HSSFCell.CELL_TYPE_STRING:
            cellValue = cell.getStringCellValue();
            if(cellValue.trim().equals("")||cellValue.trim().length()<=0)
                cellValue=" ";
            break;
        case HSSFCell.CELL_TYPE_NUMERIC:
            cellValue = String.valueOf(cell.getNumericCellValue());
            break;
        case HSSFCell.CELL_TYPE_FORMULA:
            cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
            cellValue = String.valueOf(cell.getNumericCellValue());
            break;
        case HSSFCell.CELL_TYPE_BLANK:
            cellValue=" ";
            break;
        case HSSFCell.CELL_TYPE_BOOLEAN:
            break;
        case HSSFCell.CELL_TYPE_ERROR:
            break;
        default:
            break;
        }
        return cellValue;
    }
    */


    public static void main(String[] args)
    {
        try {
            POIExcelService excelOper = new POIExcelService("产品项目导入模板.xls");
            String tmp = excelOper.getCellValue(1, 1, 1);
            System.out.println(tmp);
            excelOper.Export("产品项目导入模板_导出.xls",1,1,1,"ABCDE");


        } catch (Exception e) {
            e.printStackTrace();
        }

    }


}